User input to calculate Area or Radius of Circle

[DustinKlent]

I'm writing a practice script to prompt the user to input "Area" or "Radius", then input the area or radius of a circle to calculate the other.

I wanted to use functions to do it.

Here's what I've got so far:

import math
from math import pi

def area():
    radius = float(input("To calculate the Area enter the Radius of the circle: "))
    area = float(pi)*pow(radius,2)
    print("The Area is " + str(area))

def radius():
    area = float(input("To calculate the Radius enter the Area of the circle: "))/pi
    radius = str(math.sqrt(area))
    print("The Radius is " + radius)

choice = {'Radius': radius, 'Area': area}

action = input("Calculate Area or Radius? ")
action = action.capitalize()

choice[action]()

Is there a superior way to do this? Are there any lines I can cut or condense?